MESON Chess Problem Database

Problem Display
PID: 140361 (8/8/1QB5/2rpN2K/3kP3/4N2R/4P2B/8 w - - 0 1)

Birnov, Zinovy Markovich

Shakhmaty v SSSR, 1949

8/8/1QB5/2rpN2K/3kP3/4N2R/4P2B/8

#2

9 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...dxe4
      • 2.Sc2#
      • 2.Sf5#
  • Tries
    • 1.Sd1?
      • 1...dxe4
        • 2.e3#
      • 1...Kxe4!
    • 1.Sd3?
      • 1...dxe4+
        • 2.Be5#
        • 2.Qxc5#
      • 1...Kc3
        • 2.Qb2#
        • 2.Qb4#
      • 1...Kxe4!
    • 1.Qxc5+?
      • 1...Kxe4
        • 2.Bxd5#
        • 2.Rh4#
        • 2.Qb4#
        • 2.Qc4#
        • 2.Qxd5#
      • 1...Kxc5!
  • Keys
    • 1.S5c4!
      • 1...dxc4+
        • 2.Sf5#
      • 1...dxe4+
        • 2.Be5#
      • 1...Kc3
        • 2.Qb2#
      • 1...Kxe4
        • 2.Rh4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(C);
      • Vars
        • P(c);P_PINS(F),XP(E)::P(A)
      • Refutation
        • K(a);N_SPINR(b),P-FLIGHT,P_SPINP(c),XP(E)
    • Try
      • S(F);
      • Refutation
        • K(a);N_SPINR(b),P-FLIGHT,P_SPINP(c),XP(E)
    • Try
      • Q(H);CHECK,XR(b)
      • Refutation
        • K(a);S_FLIGHT,XQ(H)
  • Actual
    • S(F);
    • Vars
      • P(c);CHECK,SBLOCK,XS(F)::S(C)
      • P(c);CHECK,XP(E)::B(B)
      • K(a);N_SPINR(b),S_FLIGHT::QAB1(H)
      • K(a);N_SPINR(b),OGATEB,P-FLIGHT,P_SPINP(c),XP(E)::R(D)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).